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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1ff682be612e0cb4a6b474f78ba3f9913ba9b26c3dbb4698ed7d0ef2de73e1d' 
  AND token = 'x9auTKsV9D7QPVuXaUG0gmOKJqOtFEwg9Rd3ikv6Nh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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