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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8be699b99056fc5ae817cc26a706f9d163c96eb57bd7e7410a3b31667f427624' 
  AND token = 'g8+Vymed0yTmR/s+d5B/wQ2UockAg66ocUitb43I8qM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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