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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cccf1300fb4884c85ff4a3e51fe875813b67ec180d564d0e35fd8e346a5a72e5' 
  AND token = 'yVUeZg4x3PaAcW+Y/NWOjivpR/QyvcN3Tj3fFw5mNh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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