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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b2f7d2d5432a707ddb26998501ab6b17f9b74a3a21fe116c8d8ba4c36ceceb3' 
  AND token = 'oh0bSZXW7q7E0RfOGR1NaPlj7kOTsOkToajT10OYv6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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