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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd21ced6e8b2d5c01d80756d7b6a7f5c73a9fd37b690aaaca49ef41abdd74e3c5' 
  AND token = 'rL+iChfR08d4VWJxWoPvHUCvSw5YVGmYS8WgeVYxn/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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