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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'addb50ebf6fbdc76d77dbd64f5125ec388fa1a3e230c473b0f07532b3c6528bb' 
  AND token = 'hoJvgOdsKFidBKDkzeqR2NPl/BLFeLS+66eEfZyMmaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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