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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6f94e69bdde810b4e70c02cc9815b64b9eee46b0e20c75dfe8fb99de6172e98' 
  AND token = '5AUJuuj+Ro0v1w6uLmjrCeKg94S20ZEte2P/HgErBoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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