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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f88106375eb276307e52205eb4bcd8e5191bca8f650bbc72e7038002007fa94' 
  AND token = '88oZNDUc8wFwLPU/Aa03yfAcYBClSixiZ67ZdIsJ+Lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}