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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef24b567ca2a7653039974a6ec0407c36e932d075d6b5a01f80f5a9526a625ec' 
  AND token = 'cplpQfML3NkqAfbT2fEudI55Sg0XVkG65x9JjbQMhI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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