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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79aa394cb97cc3ab978af17cf7922746d4bdcac3da05efbae73134bf1e5e0816' 
  AND token = 'ECYV9t70uWGZ68zbl2aL93YZCotQerBlAUcB87efqN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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