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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '596482e2d02f5c81403d6c52dcc9aea6d48abfbc00050d4d5c3460b66a2439aa' 
  AND token = 'JVr68AgqW6ELY1Q3H7/EEjeTBL3nLFYTnzUO6N7c+u8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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