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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e38c928c31bc20eb0363a64c599d30097113ac3e651d6a6a43157a5129ab1d0' 
  AND token = 'LhoQh2XAl8djxLv4CTWXw2E6H7BJutvCmVieufoz2SQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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