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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b29513f0b551de461d1c8ad2096e74ee01122faa54853ae391ece524c74a1876' 
  AND token = '3BcoIoi2Fv5sKfNbpU+mJOK7rKhX+jRsUo7Z3WKJOvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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