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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '746c0b43c3f80236a669dd729876a33e2627f3b6e34a5b3b1d1ea82fe93d4d21' 
  AND token = 'itwofYw9su1XLErDyUmzQaP3q7s9jTuSk5smlRXQ1dE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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