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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5494b84e4d7523a7cab2130cd0888b3af509b0cbfac898169f074d4e6194cb9f' 
  AND token = '3jpFYD2Q1urnk49AtYODMUm09GDFMY2PyzUNakN+6eI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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