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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74117d4ce97e06d33d2b7202ae4bdde15c3d6a0441f75ee4c8240bf7e4127729' 
  AND token = '7MNqeRtdhPH9Yw5eD+HNE1QM9QmZygv6DCn7/fUZwEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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