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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb579c33493a6c20ab3fa4e64585eed8e2708a65dd5bd08e37a8ffcdee8dc779' 
  AND token = 'qiY6s3nneWGSxPD3hzWfcXcFAh0/fd1NisRN6bdVLW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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