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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e53d579e7909e6602337a2ddf99e0549ca29d385d7fd2d1bc1a257cd7fcfc763' 
  AND token = 'FCdhMH5kwQi1B6TSRNd9+w9/claReOLDQIpfjpH81nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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