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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52fa271d051ffb1f22c0a8f9f5c4320e1dd7e1fcc5aa2f4b012635fd1511addd' 
  AND token = 'V01aKh4yvRVEb+uD2mk0UF/OKABjKvtCJnKlErDG1jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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