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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0359a9290b808faaa9dfb1ddde1e6007d8d899d4d64ced32363610cd541a7050' 
  AND token = 'xvf36rOb5VNgpmA1DZkt6LFfrytgP5GRs5ga+U7G6GQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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