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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c92fe53468cbc23c3d3abf732962eaea7f7c9dffa6249e9d08760ada4d37aff7' 
  AND token = '7Xg+6Ij24S0gordamWEZIDLIvWPsKeN0r+2zVgs22vk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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