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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a6de83cf9afb99c566146e1a93aabef336a30e969ac0b4c8a027b15d00002e2' 
  AND token = 'm2ip54VXiTk1Tbqf1XHFtWxWIsBZwIc/5Ol9+DJliKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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