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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '914cd54ce0ef63761a405e5998ae9ff9ff776602e2fa77e224d6669344e29049' 
  AND token = 'LfwzTmGk9ePAIKXFYa9ZUu+FCogOgtKl30U6y3g5n8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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