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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '383dc669cce8580d4ffb6d71cf2a8434e80f32c9e807b98c135ce685b077d871' 
  AND token = 's4WCTioa2AUTCBm0MkfNI+l2CQBOkIUTn3OkFFGydj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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