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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e72214c3a88126a82c8a9d53c39e119873bb8af722796257debda6b0229c3cd' 
  AND token = 'u6r7IHntTc8PuMcdtFw5KzNEO6bts3AafJc/apaU7ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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