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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a891b8f2a607ae3f620b929944d4b71530d1055fd44c635df99a7473ef344b7d' 
  AND token = 'A4132Wmu7SANiPHpebMp3FHlB89lxXaxr3upwbYHY6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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