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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30a843fc489231823212bee3f826d90f0a155997841456928a1f1fea19f9e13d' 
  AND token = 'RorOHCjtccPLasi4bqRM3Hud631o+HiLjYLum2OgT3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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