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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '266edb9f04dfa44fed2dd3b2e9e57b8be88eeeccd2daa0be2a34dee9fb82a15d' 
  AND token = 'qLJZbZyeDr9mcL5/yBQFc05gemSKV+Dg+P2dHBIjlRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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