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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7c7c3a95ef435d96685cc2ea7f6093cb4542414eccf51b72cb87c2234e18c0f' 
  AND token = 'WDN6ULpuzmGyvT8NpspneLRi2ypdS/cMrKCLk8GHJyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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