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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5eb9fdbfee1bc3e9cbdf2e6e0470432b8df6761149ebe2326feb471fbe84095' 
  AND token = '2G2l/mKSX486DRKUVhHUB2viO1C4BKBMibF9htmBZso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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