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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54cb3ea33f5bf1c61063cf6b7605b67355231648bff8059f5256927f4ec13245' 
  AND token = 'dCYCYpHGHlI64zzcS3i/4dG9x3YzyRo50ngwNMXfT/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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