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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46a77c98c1bd8c404d3cd93d9dc0df4ce3cdb5f22593a142ba5bc59584c03e6f' 
  AND token = 'dWfgGEnYbubanNp5tuNQmWdulTelDWdXMNF6bV18fEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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