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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '962a570277eeb218184c533ab310494dd90a8278e19b05a1e707b8c24a01bb2a' 
  AND token = 'vY7qYh5B6leiVQCmeaHyK4Cg5Jp26kpJxoa3r2wdng8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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