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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a89d5e076bb4fc7c8d1ee451c7aa971ac142537184402c0a9b71eecfcbb8222b' 
  AND token = 'ZOO9GNQdhuKPESH2dkjLOfq0k7z03JOomzSk2uSUVaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

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