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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32fafee799f1b6f28cc45454c70661f75cb1e1584c26ae2fc960ed04c9b7ec4e' 
  AND token = 'ySk/VioEyhH7mW4JF86hXJjQp5geZ/araxhMpLVWSQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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