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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8f8b69e49e706feac0a32be76f04950895836d18fe183442e07e092a2384966' 
  AND token = 'v70RBW8/Sm9NSIKAiX75tAfA3ECA9LBcBCAItwcPJLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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