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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99ae35eee3a39ab8d811b5c338c05265bb2cf0943357cebadb02dcf0929d1582' 
  AND token = 'k7ftT3BGkjjY5sBa5RfyyIRi/Tc4WSh2a3XYDESxRVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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