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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63d2c4239e347fd4aa53d74b43a0019c725600a0c0fc98f0ce7cb3a18933258d' 
  AND token = 's7ratTUPxyuaCNr3+anoIZqmYHxajEDjN7pONrAOMiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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