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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f92e547fa78e2d89570219003d3e65ee3ed9c6c82bc260a67f51e65d16adab1b' 
  AND token = 'eOBxIFG0qmtfgF7AapGYXSVfqXlNsfOdsfV8eWqHiWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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