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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ba3be8d353d991410aa59b6ef361b049afdc04919fbfd30284bd8f1ffee866e' 
  AND token = 'waoykjfz1+9HsuK81gSE6U2jLBZ56DzKBzeMCW0sSKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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