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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d1093f3a57954b73926157f978ca358e50a8b827809f91ba98e27a83f336574' 
  AND token = 'j9PZuKpwYtuYC0ODibVD7WC50hWaAIh6Ij3L23uQ78g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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