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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b69cdd9ae5851f40c83e19eb8e8248e7a6978c9c9f5a1ab8a41f9271443ec21' 
  AND token = 'RE7fXI6diOpeI2Y1zjRTuYf0CT7M2m7DRcJQHkE0Ypw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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