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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4e03b3cd2a6e88076e06b1894003521be7bbb1440d23362ad5e78e2141d87ff' 
  AND token = 'iIezd+IjUFchBqmkiHgOxI7bOIXe+AbzFKUSIXINCcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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