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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23b02794088b9a6e9d85fd04a436e54e78e781ba462eb16777908aecabe8099c' 
  AND token = 'W6IG0vWYY3QXyu1kxmIIcLuarxA5jpilpBwEVVCg6/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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