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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '951523f0ed5717e0fa8ed7dbe4801bde0770bd545607c5dfebd0eb29a7576f65' 
  AND token = 'NvxFTlmD1U5e80uuOJ+cxqx2eq+Gpop7k6t2qXEbTqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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