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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0839091e6e5997675b6732ab190a93e6b92d7ca7138441a4ef07a6305a3691c' 
  AND token = 'SYMTsijLB3Gpte3WwGZgmSG9Lo/yGn0lcNLvl86uquc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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