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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a703d062c8361c3128a00c0e2e4837cb646529868836b191a17e98d947c9ee9a' 
  AND token = 'WSAL3SptuspCiabfihDxY0tJiY3v1XUZ5fN6+hGM/ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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