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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08485d9dcf6a4c0e82f0f1bb6b3bf97cab59df9044ce7e3e3172803882af24d0' 
  AND token = 'NoDRKvI6ZlVKV3L+iiAKAAtPdk3Qp6vLgmb1r8IiRf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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