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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2301ba2c062eca36ded925b5686c6397c24ee9f714620efd54909ea46dcf37b1' 
  AND token = 'BD8BiYfmfP57w7Q2I5sOOhanGaTMdQ5oOAdca3q2nj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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