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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc3a7728b5a9f9b07c86e17082cdf8b3beec1abf2937aa5c80c18c6b5bd311cd' 
  AND token = 'OUnvVDZki7t1/+N0fmrfR+uqT1dmWN2x4DGjl6okZkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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