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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6036c64fb17c24d5e25057a9a4d815ced06ebbc25673246662f7dc48a87f053' 
  AND token = '32OiIK7I3T156CYsnDUMOCho6MVfTYrCkDVcV2WCqAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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