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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f55d3bd1559869fd64ee39c72534a0c0870962035794d7e0c89ad75aaf56f01' 
  AND token = 'Hpx1s02JOUKMGh0v8vLSixbFvIk+guxN3kLsNrpavz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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