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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36b7ba150706d7edc14877ed51ef114c5c92f540a1de3160c18d7f07d31809c3' 
  AND token = 'AP/woATPSqc6/3eZHJHCdM0ikgM9uTexgh/Lq+Fxdog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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